Reaction of 4-cyano-5-ethoxymethylenaminooxazoles with aliphatic amines gave 7-alkylaminooxazolo[5,4-d]pyrimidines. The structure of these compounds was discussed on the basis of spectroscopic properties. These oxazolopyrimidines were converted to 9-alkylhypoxanthines by treatment with aqueous alkali (Method A) or by heating in formamide (Method B). Reaction of the ethoxymethylenamino compounds with aromatic amines gave 9-arylhypoxanthines directly (Method C).
4-Cyano-5-ethoxymethylenaminooxazoles 与脂肪胺反应生成了 7-烷基
氨基
恶唑并[5,4-d]
嘧啶。根据光谱特性讨论了这些化合物的结构。这些
噁唑并
嘧啶通过
水碱处理(方法 A)或甲酰胺加热(方法 B)转化为 9-烷基
次黄嘌呤。乙氧基亚甲基
氨基化合物与芳香胺反应,可直接得到 9-芳基
次黄嘌呤(方法 C)。